Installation manual
,
DATA
LOGGING
(TROUBLESHOOTING
AID)
When
a
genset
is
governing
properly you
should
see
reading slightly
above
and
below
the
desired
speed.
Even
a well tuned
engine
will
vary
a
little~
The
point
is
you
should
see
readings
above
and
below
the
desired
speed.
If
you
see
speed
readings
remain
more
than
20
rpm
above or
below
the
desired
speed
for
a prolonged period of
time,
there
could
be
a
problem,
especially
if
this
is
noticed
with
no
AC
load
applied
..
If
the
speed
is
too
high with
no
AC
load
applied
check
the data
box
labeled
Stepper
Pos.
(steps).
The
throttle
is
controlled
by a stepper
motor.
Usually the
step
count
for
engine
running
with
no
AC
load
is
typically
in the
20
-30
steps
range.
A couple of
steps
above
or
below
this
range
does
not
indicate
a
problem.
However,
if
the
step
count
is
in
the
single
digit
numbers
or
even
showing
a
zero,
the
problem
maybe that the throttle
body
assembly
may
be
out
of
calibration
on
not
functioning
properly.
The stepper motor can
only
go
to
a position that it thinks
is
zero. If the
calibration
is
off,
the
stepper cannot
move
the
throttle
closed
enough to
slow
the
engine
down.
An
engine
that
has
this problem
will
run
at
the
proper speed once
some
AC
load
is
added.
However,
when
that
load
is
dropped,
the
speed
will
be
too
high,
and
in
some
cases
may
cause
the
engine
to
over-speed
and shut
down.
If
the
engine
speed
is
too
low
with
no
AC
load
applied,
there
is
probably a totally
different
problem.
Again,
look
at the Stepper Position.
Is
the speed low but steps
are
high?
This
would
mean
that
the
throttle
is being opened
to
compensate
for
loss
of
speed
but the
speed
is
not
coming
up.
Check
to
make
sure
that the
fuel
level
is
full
in
the
fuel
system
and
that
tlie
fuel
is
good
and
the
filters
are
clear.
Check to
make
sure
that the air intake
scrc;:ens.
are
clean.
Check
to
make
sure
that
the
spark plugs
are
not fouled out
(bleed
the
fuel
system
looking
for
air).
If
the
engine
speed
is
okay
when running
With
no
AC
load, but once
underway
with
some
AC
load
being
applied
the speed
drops
and
stays below
the
desired
speed, first
check
the
AC
power
by
multiplying
the
total
AC
amperage
times
the
AC
volts
to
get
the kilowatts.
If
this
number
is
higher
than
what
the
unit
is
rated
for,
then it
is
overloaded.
Shut off
some
of
the
devices
until
the
speed
returns
to
normal
and check the power
again.
If
there
is
only a
small
AC
load
applied
and
the
speed
cannot
maintain,
follow
the
same
suggestions
from
the
previous
paragraph.
Pressure (kPa)
This is
the
pressure
that
exists
in
the
intake
manifold.
At
no
load
the
kPa
will
be
lower
than at
full
load.
The
wider
the throttle plate
is
opened
the
closer
it
gets
to
atmosphere
which
is
about
100
kPa.
Typically
a
genset
running
at
no
load
will
see
a kPa value
around
30,
while
at
full
load
it
would
be
around
90
kPa.
If
the
kPa
is
stuck
at
70
and
never moves than there
is
a problem with
either
the
MAP
sensor
or
the
wiring
to
the
MAP
sensor,
as
70
is a default
value
that
is
in
the
code.
WB Heater Set-point
This
is
the
set-point
in millivolts
of
the
heater
temperature
in
the
Wideband
02
Sensor.
Currently
in
all
the
units that
do
not
have
an
idle mode, the set-point
is
893.
In
other
units
the set-
point will
vary,
but will
be
displayed
in
this
box.
WB Current Temp
'Tins
is
the
actual
value in millivolts
of
the
heater
temperature in the
Wideband
02
Sensor.
If
the
heater
is
working
properly,
you
will
typically
see
values
stay
within
20
millivolts of the set-ยท
point.
The
higher
the number
is,
the
colder
the
heater
is.
Typically a
reading
in the
4000
area
means
that
the
heater is not working at
all.
If the value
is
swinging dramatically
above
and
below
the
set-point
the
sensor
is
probably
failing.
The
sensor
should
be
replaced.
32